Malicious PDF — malware analysis report

Static analysis result for SHA-256 3918c906317cc0cc…

MALICIOUS

PDF

45.0 KB
MD5: dbcad02212e575c0a434a1a06d959108 SHA-1: 7a85d8819d2050f746487d675cd9ce8ea11d8099 SHA-256: 3918c906317cc0cc5179388f0ac9e1ebf30afe82bf63e24695eb38676733260c
106 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identifying it as 'Pdf.Exploit.Agent-36128'. The embedded JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
15601e6eb5ff8253508fae9db7392c72933193bdfe69864619c7186899ea0de7		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
legacy_pdfkit_stage_000.js
b199b9849a178ecfe3a3b50ce146a121b8587603f38282663f69209a7a7a3515		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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